Amnesia: A Machine for Pigs

The game features several interlocking storylines. Some take place in the past, some in the present, and some are overtly real while some may be imagined. Set in London on New Year's Eve, 1899, the game's protagonist is Oswald Mandus, a wealthy industrialist and butcher. At the beginning of the game, he awakens from a fever that has lasted for several months, after returning from a disastrous expedition to explore Aztec ruins in Mexico. He hears the voices of his sons, Edwin and Enoch, calling for him as they lead him through the different areas.
Mandus receives a call from "the Engineer", who tells Mandus that Edwin and Enoch have been trapped far below them, in the "Machine" which Mandus created beneath his house. The Machine has been sabotaged, putting his sons in danger. The Engineer tasks Mandus with clearing the floodwaters and bringing the Machine back online, providing ongoing guidance through telephones throughout the facility. Mandus is opposed in his tasks by the Manpigs, deformed swine-like monstrosities that patrol the depths through which he descends.
After a series of puzzle-like tasks, Mandus eventually reactivates the Machine, but the Engineer betrays him, taking control of the Machine and unleashing Manpigs out into the streets of London to round up unsuspecting victims with which to feed itself. Mandus regains his memory, recalling the recent past: after returning from Mexico, Mandus was consumed with obsession over a vision of the future presented by an artifact discovered in an Aztec temple by him and his children, known as the "egg,” hinted to be an Orb. In this vision, Mandus witnesses numerous horrors and atrocities that will occur in the coming century, including Edwin and Enoch's deaths at the Battle of the Somme. Driven mad by the vision, Mandus decided that he could not allow it to come to pass, and he built the Machine to create a godlike being via mass ritual human sacrifice to save humanity from its own carnage. He sacrificed Edwin and Enoch to the machine to spare them their fate at the Somme. From there, Mandus began a one-man vendetta against mankind, holding massive parties where he would capture and grind up rich socialites into sausage to sell, and killing hordes of child workers to feed the captive Manpigs. At one point, Mandus' soul ended up splintered in the madness, with the evil, wicked fragments merging with the Machine, creating the Engineer. Mandus, however, soon came to realize the error of his ways and in a bid to stop the Machine, he attempted to sabotage it, before he was hindered by the onset of amnesia and sickness.
Now remembering everything, Mandus vows to finish what he started by destroying the Machine once and for all. Despite the pleas of the Engineer, who believes the world would be better off if the Machine is allowed to consume it, Mandus succeeds in recreating most of the sabotage. As Mandus reaches the core of the Machine; built to resemble an Aztec temple, the Engineer begs for Mandus to stop, reminding him of the future atrocities he witnessed, including the atomic bombings, and the Cambodian genocide. Ultimately, Mandus sacrifices himself to the Machine, putting an end to both it and the Engineer, and ending the horrors above as year 1900 begins.